Re: [RFC 2/3] drm/i915: create intel_update_pipe_size()

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Sep 09, 2014 at 11:43:20AM -0300, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> 
> Factor out a piece of code from intel_pipe_set_base() that updates
> the pipe size and adjust fitter.
> 
> This will help refactor the update primary plane path.
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 71 +++++++++++++++++++++---------------
>  1 file changed, 41 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 2ccf7c0..e7e7184 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2779,6 +2779,46 @@ static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
>  	return pending;
>  }
>  
> +static void intel_update_pipe_size(struct drm_crtc *crtc)

These days we usually prefer to pass intel_crtc instead of drm_crtc. You
can still call it 'crtc' since that's shorter and because we don't need
anything from drm_crtc in this function there won't be any confusion
between the two.

Otherwise the patch looks good.

> +{
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct drm_device *dev = crtc->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	const struct drm_display_mode *adjusted_mode;
> +
> +	if (!i915.fastboot)
> +		return;
> +
> +	/*
> +	 * Update pipe size and adjust fitter if needed: the reason for this is
> +	 * that in compute_mode_changes we check the native mode (not the pfit
> +	 * mode) to see if we can flip rather than do a full mode set. In the
> +	 * fastboot case, we'll flip, but if we don't update the pipesrc and
> +	 * pfit state, we'll end up with a big fb scanned out into the wrong
> +	 * sized surface.
> +	 *
> +	 * To fix this properly, we need to hoist the checks up into
> +	 * compute_mode_changes (or above), check the actual pfit state and
> +	 * whether the platform allows pfit disable with pipe active, and only
> +	 * then update the pipesrc and pfit state, even on the flip path.
> +	 */
> +
> +	adjusted_mode = &intel_crtc->config.adjusted_mode;
> +
> +	I915_WRITE(PIPESRC(intel_crtc->pipe),
> +		   ((adjusted_mode->crtc_hdisplay - 1) << 16) |
> +		   (adjusted_mode->crtc_vdisplay - 1));
> +	if (!intel_crtc->config.pch_pfit.enabled &&
> +	    (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) ||
> +	     intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))) {
> +		I915_WRITE(PF_CTL(intel_crtc->pipe), 0);
> +		I915_WRITE(PF_WIN_POS(intel_crtc->pipe), 0);
> +		I915_WRITE(PF_WIN_SZ(intel_crtc->pipe), 0);
> +	}
> +	intel_crtc->config.pipe_src_w = adjusted_mode->crtc_hdisplay;
> +	intel_crtc->config.pipe_src_h = adjusted_mode->crtc_vdisplay;
> +}
> +
>  static int
>  intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
>  		    struct drm_framebuffer *fb)
> @@ -2821,36 +2861,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
>  		return ret;
>  	}
>  
> -	/*
> -	 * Update pipe size and adjust fitter if needed: the reason for this is
> -	 * that in compute_mode_changes we check the native mode (not the pfit
> -	 * mode) to see if we can flip rather than do a full mode set. In the
> -	 * fastboot case, we'll flip, but if we don't update the pipesrc and
> -	 * pfit state, we'll end up with a big fb scanned out into the wrong
> -	 * sized surface.
> -	 *
> -	 * To fix this properly, we need to hoist the checks up into
> -	 * compute_mode_changes (or above), check the actual pfit state and
> -	 * whether the platform allows pfit disable with pipe active, and only
> -	 * then update the pipesrc and pfit state, even on the flip path.
> -	 */
> -	if (i915.fastboot) {
> -		const struct drm_display_mode *adjusted_mode =
> -			&intel_crtc->config.adjusted_mode;
> -
> -		I915_WRITE(PIPESRC(intel_crtc->pipe),
> -			   ((adjusted_mode->crtc_hdisplay - 1) << 16) |
> -			   (adjusted_mode->crtc_vdisplay - 1));
> -		if (!intel_crtc->config.pch_pfit.enabled &&
> -		    (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) ||
> -		     intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))) {
> -			I915_WRITE(PF_CTL(intel_crtc->pipe), 0);
> -			I915_WRITE(PF_WIN_POS(intel_crtc->pipe), 0);
> -			I915_WRITE(PF_WIN_SZ(intel_crtc->pipe), 0);
> -		}
> -		intel_crtc->config.pipe_src_w = adjusted_mode->crtc_hdisplay;
> -		intel_crtc->config.pipe_src_h = adjusted_mode->crtc_vdisplay;
> -	}
> +	intel_update_pipe_size(crtc);
>  
>  	dev_priv->display.update_primary_plane(crtc, fb, x, y);
>  
> -- 
> 1.9.3
> 
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-- 
Ville Syrjälä
Intel OTC